@book{neuere+tunnel+bauten+gesteinsbohrmaschinen+und+bergeisenbahnen+der+gegenwart,
    author = {Zwick, Hermann},
    title = {Neuere Tunnel-Bauten : Gesteinsbohrmaschinen und Bergeisenbahnen der Gegenwart},
    address = {Leipzig},
    publisher = {Carl Scholtze},
    date = {1876}
}